Definition of "Tread" :
noun: a step in walking or running
noun: structural member consisting of the horizontal part of a stair or step
noun: the part (as of a wheel or shoe) that makes contact with the ground
noun: the grooved surface of a pneumatic tire
verb: brace (an archer's bow) by pressing the foot against the center
verb: mate with
"Male birds tread the females."
verb: crush as if by treading on
"Tread grapes to make wine."
verb: tread or stomp heavily or roughly
verb: put down or press the foot, place the foot
"For fools rush in where angels fear to tread."
verb: apply (the tread) to a tire